diff options
Diffstat (limited to 'mysql-test/r/distinct.result')
| -rw-r--r-- | mysql-test/r/distinct.result | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/mysql-test/r/distinct.result b/mysql-test/r/distinct.result index e1a8a3151e9..109ddcd02e1 100644 --- a/mysql-test/r/distinct.result +++ b/mysql-test/r/distinct.result @@ -530,7 +530,8 @@ id select_type table type possible_keys key key_len ref rows Extra EXPLAIN SELECT DISTINCT a,b FROM t1 GROUP BY a,b; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t1 ALL NULL NULL NULL NULL 3 -CREATE TABLE t2(a INT, b INT, c INT, d INT, PRIMARY KEY (a,b)); +CREATE TABLE t2(a INT, b INT NOT NULL, c INT NOT NULL, d INT, +PRIMARY KEY (a,b)); INSERT INTO t2 VALUES (1,1,1,50), (1,2,3,40), (2,1,3,4); EXPLAIN SELECT DISTINCT a FROM t2; id select_type table type possible_keys key key_len ref rows Extra @@ -644,3 +645,26 @@ SELECT COUNT(*) FROM COUNT(*) 2 DROP TABLE t1, t2; +CREATE TABLE t1 (a INT, UNIQUE (a)); +INSERT INTO t1 VALUES (4),(null),(2),(1),(null),(3); +EXPLAIN SELECT DISTINCT a FROM t1; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 index NULL a 5 NULL 6 Using index +SELECT DISTINCT a FROM t1; +a +NULL +1 +2 +3 +4 +EXPLAIN SELECT a FROM t1 GROUP BY a; +id select_type table type possible_keys key key_len ref rows Extra +1 SIMPLE t1 index NULL a 5 NULL 6 Using index +SELECT a FROM t1 GROUP BY a; +a +NULL +1 +2 +3 +4 +DROP TABLE t1; |